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Marlboro Lights (Gold): Lower tar and nicotine content compared to Reds and Mediums, available in king size and 100s

Smoke is produced both when a cigarette is actively puffed (mainstream smoke) and when it smolders between puffs (sidestream smoke)

Its hard to isolate the effects of nicotine from those of tobacco, but animal and laboratory studies suggest nicotine could be responsible for cognitive and behavioral changes including addiction in people who begin using it as youths

Read MoreThe real winner in the Lorillard takeover: BAT "With blu's business in the U.K., it was competing with BAT, and it feels like BAT wouldn't want to be contributing $4.7 billion to compete with itself," Lavery said